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#include <uchar.h>
#include <wchar.h>
size_t mbrtoc16(char16_t *restrict pc16, const char *restrict s, size_t n, mbstate_t *restrict ps)
{
static unsigned internal_state;
if (!ps) ps = (void *)&internal_state;
unsigned *pending = (unsigned *)ps;
if (!s) return mbrtoc16(0, "", 1, ps);
/* mbrtowc states for partial UTF-8 characters have the high bit set;
* we use nonzero states without high bit for pending surrogates. */
if ((int)*pending > 0) {
if (pc16) *pc16 = *pending;
*pending = 0;
return -3;
}
wchar_t wc;
size_t ret = mbrtowc(&wc, s, n, ps);
if (ret <= 4) {
if (wc >= 0x10000) {
*pending = (wc & 0x3ff) + 0xdc00;
wc = 0xd7c0 + (wc >> 10);
}
if (pc16) *pc16 = wc;
}
return ret;
}
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